Fortunately, the new part has a different SKU so you can know if you're buying the updated version:
If you want to know which part you're buying, be on the lookout for part number YD1200BBM4KAFBOX for the new version. The old 14nm Ryzen 3 1200 was listed as YD1200BBM4KAEBOX. The boxed version comes with the Wraith Stealth cooler included as standard.The Ryzen 3 1200 "AF" should be a bit faster than the original model thanks to architectural improvements.